I am trying to develop a WordPress plugin with a menu page. I am currently just trying to save to options in the menu. But when clicking the submit button, i get an error saying, that the options page could not be found.

It obvioulsy redirects to /options.php (snce it’s declared in the action parameter of the form element) which is not in my plugin folder. So I understand the error, but I looked up several tutorials and they seem to do it the same way.